A radio communication system includes: a plurality of cells having different scrambling sequences, respectively, wherein at least two cells communicate with at least two user terminals connected to different serving cells; and a controller which controls the plurality of cells and provides a single scrambling sequence to said at least two cells and said at least two user terminals for control signal transmission and reception.
Legal claims defining the scope of protection. Each claim is shown in both the original legal language and a plain English translation.
1. A base station, comprising: a controller configured to: scramble a first scheduling assignment by a first scrambling sequence, the first scrambling sequence being initialized with a first scrambling initialization parameter, c init,1 , as follows: c init , 1 = ⌊ n s 2 ⌋ 2 9 + N I D Cell where N ID cell is a cell identity (ID), and n s is slot number within a radio frame; and a transmitter configured to: transmit the scrambled first scheduling assignment carried on a physical downlink control channel (PDCCH) to a user equipment (UE); and transmit an enhanced physical downlink control channel configuration (EPDCCH-config) included in radio resource control (RRC) signaling to the UE, the EPDCCH-config including a virtual ID for EPDCCH, wherein the controller is further configured to: scramble a second scheduling assignment by a second scrambling sequence, the second scrambling sequence being initialized with a second scrambling initialization parameter, c init,2 , as follows: c init , 2 = ⌊ n s 2 ⌋ 2 9 + N I D Virtual where N ID Virtual is the virtual ID, and wherein the transmitter is further configured to: transmit the scrambled second scheduling assignment carried on an enhanced physical downlink control channel (EPDCCH) to the UE.
A base station transmits scheduling assignments to a user equipment (UE) using two different channels: PDCCH and EPDCCH. For the PDCCH, the base station scrambles a first scheduling assignment using a first scrambling sequence. This sequence is initialized using a cell ID. Specifically, the initialization parameter is calculated as: `c_init_1 = floor(n_s / 2) * 2^9 + N_ID_cell`, where `n_s` is the slot number in the radio frame, and `N_ID_cell` is the cell ID. For the EPDCCH, the base station transmits an EPDCCH configuration to the UE via RRC signaling, which includes a virtual ID. The base station scrambles a second scheduling assignment using a second scrambling sequence initialized with this virtual ID: `c_init_2 = floor(n_s / 2) * 2^9 + N_ID_Virtual`, where `N_ID_Virtual` is the virtual ID.
2. The base station of claim 1 , wherein the virtual ID is independent of the cell ID.
The base station scheduling system described previously utilizes a virtual ID for EPDCCH scrambling that is independent of the physical cell ID. This means the `N_ID_Virtual` value used in the scrambling sequence initialization (`c_init_2 = floor(n_s / 2) * 2^9 + N_ID_Virtual`) is not directly derived from or related to the base station's cell identity (`N_ID_cell`), used for the PDCCH scrambling.
3. A user equipment (UE), comprising: a receiver configured to: receive, from a base station, a scrambled first scheduling assignment carried on a PDCCH, the scrambled first scheduling assignment being scrambled by a first scrambling sequence that is initialized with a first scrambling initialization parameter, c init,1 , as follows: c init , 1 = ⌊ n s 2 ⌋ 2 9 + N I D Cell where N ID Cell is a cell ID, and n s is slot number within a radio frame, receive, from the base station, an EPDCCH-config included in RRC signaling, the EPDCCH-config including a virtual ID for EPDCCH, and receive, from the base station, a scrambled second scheduling assignment carried on an EPDCCH, the scrambled second scheduling assignment being scrambled by a second scrambling sequence that is initialized with a second scrambling initialization parameter, c init,2 , as follows: c init , 2 = ⌊ n s 2 ⌋ 2 9 + N I D Virtual where N ID Virtual is the virtual ID; and a detector configured to: descramble the scrambled first scheduling assignment in accordance with the cell ID, and descramble the scrambled second scheduling assignment in accordance with the virtual ID.
A user equipment (UE) receives scheduling assignments from a base station via PDCCH and EPDCCH. For PDCCH, the UE receives a scrambled first scheduling assignment, scrambled using a first scrambling sequence initialized with `c_init_1 = floor(n_s / 2) * 2^9 + N_ID_cell` (where `N_ID_cell` is the cell ID and `n_s` is the slot number). The UE also receives an EPDCCH configuration via RRC signaling, containing a virtual ID. For EPDCCH, the UE receives a scrambled second scheduling assignment, scrambled using a second scrambling sequence initialized with `c_init_2 = floor(n_s / 2) * 2^9 + N_ID_Virtual` (where `N_ID_Virtual` is the virtual ID). The UE descrambles the first assignment using the cell ID and the second assignment using the virtual ID.
4. The UE of claim 1 , wherein the virtual ID is independent of the cell ID.
The user equipment (UE) as described in the previous claim receives scheduling information scrambled using a virtual ID that is independent of the cell ID. This means that the value `N_ID_Virtual` used to descramble the EPDCCH is not based on the serving cell's identity `N_ID_cell`. The virtual ID and cell ID are distinct values.
5. A method for transmitting scheduling assignments, comprising: scrambling a first scheduling assignment by a first scrambling sequence, the first scrambling sequence being initialized with a first scrambling initialization parameter, c init,1 , as follows: c init , 1 = ⌊ n s 2 ⌋ 2 9 + N I D Cell where N ID Cell is a cell ID, and n s is slot number within a radio frame; transmitting the scrambled first scheduling assignment carried on a PDCCH to a UE; transmitting an EPDCCH-config included in RRC signaling to the UE, the EPDCCH-config including a virtual ID for EPDCCH; scrambling a second scheduling assignment by a second scrambling sequence, the second scrambling sequence being initialized with a second scrambling initialization parameter, c init,2 , as follows: c init , 2 = ⌊ n s 2 ⌋ 2 9 + N I D Virtual where N ID Virtual is the virtual ID; and transmitting the scrambled second scheduling assignment carried on an EPDCCH to the UE.
A method for transmitting scheduling assignments involves scrambling a first scheduling assignment using a sequence initialized with a cell ID (`c_init_1 = floor(n_s / 2) * 2^9 + N_ID_cell`), and transmitting this scrambled assignment via PDCCH to a UE. An EPDCCH configuration containing a virtual ID is also transmitted to the UE via RRC signaling. A second scheduling assignment is then scrambled using a sequence initialized with the virtual ID (`c_init_2 = floor(n_s / 2) * 2^9 + N_ID_Virtual`), and this scrambled assignment is transmitted via EPDCCH to the UE.
6. The method of claim 5 , wherein the virtual ID is independent of the cell ID.
In the scheduling assignment transmission method described previously, the virtual ID used for EPDCCH scrambling is independent of the cell ID. This ensures that the scrambling sequences used for the PDCCH and EPDCCH are based on different identifiers, enhancing flexibility and potentially reducing interference.
7. A method for receiving scheduling assignments, comprising: receiving, from a base station, a scrambled first scheduling assignment carried on a PDCCH, the scrambled first scheduling assignment being scrambled by a first scrambling sequence that is initialized with a first scrambling initialization parameter, c init,1 , as follows: c init , 1 = ⌊ n s 2 ⌋ 2 9 + N I D Cell where N ID Cell is a cell ID, and n s is slot number within a radio frame; receiving, from the base station, an EPDCCH-config included in RRC signaling, the EPDCCH-config including a virtual ID for EPDCCH; receiving, from the base station, a scrambled second scheduling assignment carried on an EPDCCH, the scrambled second scheduling assignment being scrambled by a second scrambling sequence that is initialized with a second scrambling initialization parameter, c init,2 , as follows: c init , 2 = ⌊ n s 2 ⌋ 2 9 + N I D Virtual where N ID Virtual is the virtual ID, and descrambling the scrambled first scheduling assignment in accordance with the cell ID; and descrambling the scrambled second scheduling assignment in accordance with the virtual ID.
A method for receiving scheduling assignments includes receiving a scrambled first scheduling assignment via PDCCH, scrambled using a sequence initialized with a cell ID (`c_init_1 = floor(n_s / 2) * 2^9 + N_ID_cell`). An EPDCCH configuration containing a virtual ID is also received via RRC signaling. A scrambled second scheduling assignment is received via EPDCCH, scrambled using a sequence initialized with the virtual ID (`c_init_2 = floor(n_s / 2) * 2^9 + N_ID_Virtual`). The first assignment is descrambled using the cell ID and the second assignment is descrambled using the virtual ID.
8. The method of claim 7 , wherein the virtual ID is independent of the cell ID.
The method for receiving scheduling assignments as described previously involves using a virtual ID that is independent of the cell ID for descrambling the EPDCCH. This means the `N_ID_Virtual` is not directly derived or related to the serving cell's `N_ID_cell`.
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January 30, 2012
April 25, 2017
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